Malicious PDF — malware analysis report

Static analysis result for SHA-256 b583b0e71a61a40e…

MALICIOUS

PDF

82.4 KB Created: 2021-09-14 05:06:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 68016b41f3836aae5a2a5550a7e752a7 SHA-1: f9ba8a5be84da1a78c9a724048b958aaf05a7915 SHA-256: b583b0e71a61a40e03bd5a09b03d5919a0eaa0943557d06ee224c597c8919e4b
174 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1539 Steal or Forge Credentials

This PDF file was flagged by multiple heuristics, including a high-confidence ML classifier and ClamAV detection, indicating malicious intent. The presence of embedded JavaScript and numerous external URIs, particularly those associated with link farms and disposable hosting, suggests it's designed to redirect users to phishing or credential harvesting sites. The 'SE_MFA_LURE' heuristic specifically points to a tactic of stealing session tokens or abusing multi-factor authentication, which is a common phishing technique.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • MFA / one-time-code harvesting lure high SE_MFA_LURE
    Document asks for a one-time code, authenticator approval, or MFA confirmation — consistent with credential phishing kits that steal session tokens or abuse multi-factor authentication
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://synerhu.ru/uplcv?utm_term=free+debit+card+number+and+cvv+with+money PDF link annotation
    • https://keyseries.us/userfiles/file/tinerapididadibalaxa.pdfIn PDF document text
    • http://www.erealitysolutions.com/tennisontario/assets/appsadmin/js/ckfinder/userfiles/files/40974784642.pdfIn PDF document text
    • https://sandalyecenneti.com/wp-content/plugins/super-forms/uploads/php/files/vmatu0hj4mo43kikc0esnr2mqu/robifewudobeto.pdfIn PDF document text
    • https://partroyfuneralhome.com/partroy/assets/file/fapojenumobul.pdfIn PDF document text
    • http://gpmpoolandspa.com/ckfinder/userfiles/files/xodaparufoweteso.pdfIn PDF document text
    • http://idcla.net/upload/files/73771311817.pdfIn PDF document text
    • http://gardens-spa.com/user_pict/file/49189132549.pdfIn PDF document text
    • https://jamuiboe.com/webroot/upload_media/sabigu.pdfIn PDF document text
    • http://adbrf.com/files/fckeditor/file/36326041061370fee3808c.pdfIn PDF document text
    • https://santa.sg/images/users/00000000/files/66718454136.pdfIn PDF document text
    • https://unchiulmihai.ro/files/fckeditor/file/fewopavenizovubunoka.pdfIn PDF document text
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/1613fd19facfde---zojoxuvifoluriza.pdfIn PDF document text
    • https://esperanzadeavila.com/fotos/file/78275277513.pdfIn PDF document text
    • http://kernenshepler.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/17626459737.pdfIn PDF document text
    • https://oncetrabzon.com/resimler/files/79789184810.pdfIn PDF document text
    • http://gezond-trakteren.nl/kasteel-doornenburg-img/bestandenfile/sidina.pdfIn PDF document text
    • http://wefocusdesign.com/upload/files/logovisa.pdfIn PDF document text
    • http://suncitygroup.ir/basefile/suncitygroupir/files/vimusumasunazasukuz.pdfIn PDF document text
    • https://jamurgoreng.net/contents/files/89523478118.pdfIn PDF document text
    • https://certifiedcollisionrepair.com/home/cert/public_html/ckfinder/userfiles/files/56441037933.pdfIn PDF document text
    • http://ylpcl.com/ckfinder/userfiles/files/nabegoliso.pdfIn PDF document text
    • https://portofcrotone.com/dati/upload/file/bewomufurisa.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ddb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDB2 17556 bytes
SHA-256: 7540ffed8971acfc0c579905db411123c0ad0e1ede9847abac12a52db0338680
font_01_sfnt_off00010b3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B3A 10904 bytes
SHA-256: 8d9e96a0d965a32db9ebf0278f8e45cecbe15470a7985769b0620310ac3f5343
font_02_sfnt_off00012448.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12448 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1